{
  "resourceType": "CodeSystem",
  "id": "data-absent-reason",
  "meta": {
    "lastUpdated": "2017-04-18T21:44:43.294+00:00"
  },
  "text": {
    "status": "extensions",
    "div": "<div xmlns=\"http://www.w3.org/1999/xhtml\"><h2>DataAbsentReason</h2><div><p>Used to specify why the normally expected content of the data element is missing.</p></div><p>This code system http://hl7.org/fhir/data-absent-reason defines the following codes:</p><table class=\"codes\"><tr><td><b>Lvl</b></td><td><b>Code</b></td><td><b>Display</b></td><td><b>Definition</b></td><td><b>Comments</b></td></tr><tr><td>1</td><td>unknown\r\n                  <a name=\"data-absent-reason-unknown\"></a></td><td>Unknown</td><td>The value is not known.</td><td /></tr><tr><td>1</td><td>asked\r\n                  <a name=\"data-absent-reason-asked\"></a></td><td>Asked</td><td>The source human does not know the value.</td><td /></tr><tr><td>1</td><td>temp\r\n                  <a name=\"data-absent-reason-temp\"></a></td><td>Temp</td><td>There is reason to expect (from the workflow) that the value may become known.</td><td /></tr><tr><td>1</td><td>not-asked\r\n                  <a name=\"data-absent-reason-not-asked\"></a></td><td>Not Asked</td><td>The workflow didn't lead to this value being known.</td><td /></tr><tr><td>1</td><td>masked\r\n                  <a name=\"data-absent-reason-masked\"></a></td><td>Masked</td><td>The information is not available due to security, privacy or related reasons.</td><td>Using \"masked\" may be breach of security or confidentiality, but there are times when its use is required to support alternate workflows for gaining access to denied information.</td></tr><tr><td>1</td><td>unsupported\r\n                  <a name=\"data-absent-reason-unsupported\"></a></td><td>Unsupported</td><td>The source system wasn't capable of supporting this element.</td><td /></tr><tr><td>1</td><td>astext\r\n                  <a name=\"data-absent-reason-astext\"></a></td><td>As Text</td><td>The content of the data is represented in the resource narrative.</td><td>it may be linked by internal references (e.g. xml:id). This usually implies that the value could not be represented in the correct format - this may be due to system limitations, or this particular data value</td></tr><tr><td>1</td><td>error\r\n                  <a name=\"data-absent-reason-error\"></a></td><td>Error</td><td>Some system or workflow process error means that the information is not available.</td><td /></tr><tr><td>2</td><td>  NaN\r\n                  <a name=\"data-absent-reason-NaN\"></a></td><td>Not a Number</td><td>NaN, standing for not a number, is a numeric data type value representing an undefined or unrepresentable value.</td><td>This is sometimes an output value from measuring devices</td></tr><tr><td>1</td><td>not-performed\r\n                  <a name=\"data-absent-reason-not-performed\"></a></td><td>Not Performed</td><td>The value is not available because the observation procedure (test, etc.) was not performed.</td><td /></tr></table></div>"
  },
  "extension": [
    {
      "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-ballot-status",
      "valueString": "Informative"
    },
    {
      "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-fmm",
      "valueInteger": 0
    }
  ],
  "url": "http://hl7.org/fhir/data-absent-reason",
  "identifier": {
    "system": "urn:ietf:rfc:3986",
    "value": "urn:oid:2.16.840.1.113883.4.642.1.6"
  },
  "version": "3.0.1",
  "name": "DataAbsentReason",
  "status": "draft",
  "experimental": false,
  "date": "2017-04-18T21:44:43+00:00",
  "description": "Used to specify why the normally expected content of the data element is missing.",
  "caseSensitive": true,
  "valueSet": "http://hl7.org/fhir/ValueSet/data-absent-reason",
  "content": "complete",
  "concept": [
    {
      "code": "unknown",
      "display": "Unknown",
      "definition": "The value is not known."
    },
    {
      "code": "asked",
      "display": "Asked",
      "definition": "The source human does not know the value."
    },
    {
      "code": "temp",
      "display": "Temp",
      "definition": "There is reason to expect (from the workflow) that the value may become known."
    },
    {
      "code": "not-asked",
      "display": "Not Asked",
      "definition": "The workflow didn't lead to this value being known."
    },
    {
      "extension": [
        {
          "url": "http://hl7.org/fhir/StructureDefinition/codesystem-comments",
          "valueString": "Using \"masked\" may be breach of security or confidentiality, but there are times when its use is required to support alternate workflows for gaining access to denied information."
        }
      ],
      "code": "masked",
      "display": "Masked",
      "definition": "The information is not available due to security, privacy or related reasons."
    },
    {
      "code": "unsupported",
      "display": "Unsupported",
      "definition": "The source system wasn't capable of supporting this element."
    },
    {
      "extension": [
        {
          "url": "http://hl7.org/fhir/StructureDefinition/codesystem-comments",
          "valueString": "it may be linked by internal references (e.g. xml:id). This usually implies that the value could not be represented in the correct format - this may be due to system limitations, or this particular data value"
        }
      ],
      "code": "astext",
      "display": "As Text",
      "definition": "The content of the data is represented in the resource narrative."
    },
    {
      "code": "error",
      "display": "Error",
      "definition": "Some system or workflow process error means that the information is not available.",
      "concept": [
        {
          "extension": [
            {
              "url": "http://hl7.org/fhir/StructureDefinition/codesystem-comments",
              "valueString": "This is sometimes an output value from measuring devices"
            }
          ],
          "code": "NaN",
          "display": "Not a Number",
          "definition": "NaN, standing for not a number, is a numeric data type value representing an undefined or unrepresentable value."
        }
      ]
    },
    {
      "code": "not-performed",
      "display": "Not Performed",
      "definition": "The value is not available because the observation procedure (test, etc.) was not performed."
    }
  ]
}